The strength will vary on military strength as well. But given the fact of what happened Afghanistan, this made the conclusion that the military strength of the US had declined. In many aspects actually because in the race to Space, China had won already and in the case of military weapons, China had the hypersonic as well.
We have not really seen Dongfeng17 in use and hope to not see it because warheads flying all the way across the world are not going to make us survive even if we are a hundred miles away from the target. This is why they do have the chance of winning in a military confrontation especially if they can hit the Whitehouse while they are not in the Mexican gulf.
Many of the overhyped American defense innovations have failed in actual use scenario. One perfect example is that of the Lockheed Martin F-35 Lightning II fighter jet. The Americans spent around $1.7 trillion on the development of this jet, and in the end they got a product that is much inferior to the Russian Sukhoi Su-57 (which was developed at a cost of around $60 billion). And the most comic part is that a part of the cost was borne by the European allies such as France and Germany. The unit cost is also much lower. Su-57 costs $35 per piece, while F-35 costs $110 million.